結果
問題 | No.470 Inverse S+T Problem |
ユーザー | koyumeishi |
提出日時 | 2016-12-20 02:08:12 |
言語 | C++14 (gcc 12.3.0 + boost 1.83.0) |
結果 |
AC
|
実行時間 | 16 ms / 2,000 ms |
コード長 | 7,519 bytes |
コンパイル時間 | 1,716 ms |
コンパイル使用メモリ | 137,036 KB |
実行使用メモリ | 6,944 KB |
最終ジャッジ日時 | 2024-06-01 22:33:48 |
合計ジャッジ時間 | 2,841 ms |
ジャッジサーバーID (参考情報) |
judge3 / judge4 |
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テストケース
テストケース表示入力 | 結果 | 実行時間 実行使用メモリ |
---|---|---|
testcase_00 | AC | 1 ms
6,812 KB |
testcase_01 | AC | 1 ms
6,944 KB |
testcase_02 | AC | 1 ms
6,940 KB |
testcase_03 | AC | 1 ms
6,940 KB |
testcase_04 | AC | 1 ms
6,944 KB |
testcase_05 | AC | 1 ms
6,944 KB |
testcase_06 | AC | 15 ms
6,944 KB |
testcase_07 | AC | 16 ms
6,940 KB |
testcase_08 | AC | 15 ms
6,940 KB |
testcase_09 | AC | 2 ms
6,944 KB |
testcase_10 | AC | 2 ms
6,940 KB |
testcase_11 | AC | 2 ms
6,940 KB |
testcase_12 | AC | 2 ms
6,940 KB |
testcase_13 | AC | 2 ms
6,940 KB |
testcase_14 | AC | 2 ms
6,940 KB |
testcase_15 | AC | 2 ms
6,940 KB |
testcase_16 | AC | 1 ms
6,940 KB |
testcase_17 | AC | 2 ms
6,940 KB |
testcase_18 | AC | 2 ms
6,940 KB |
testcase_19 | AC | 2 ms
6,944 KB |
testcase_20 | AC | 1 ms
6,940 KB |
testcase_21 | AC | 1 ms
6,944 KB |
testcase_22 | AC | 1 ms
6,944 KB |
testcase_23 | AC | 2 ms
6,944 KB |
testcase_24 | AC | 1 ms
6,944 KB |
testcase_25 | AC | 1 ms
6,940 KB |
testcase_26 | AC | 2 ms
6,940 KB |
testcase_27 | AC | 2 ms
6,940 KB |
testcase_28 | AC | 3 ms
6,940 KB |
testcase_29 | AC | 2 ms
6,944 KB |
testcase_30 | AC | 2 ms
6,944 KB |
ソースコード
#include <iostream> #include <vector> #include <cstdio> #include <sstream> #include <map> #include <string> #include <algorithm> #include <queue> #include <cmath> #include <functional> #include <set> #include <ctime> #include <random> #include <chrono> #include <cassert> #include <tuple> #include <utility> using namespace std; namespace { using Integer = long long; //__int128; template<class T, class S> istream& operator >> (istream& is, pair<T,S>& p){return is >> p.first >> p.second;} template<class T> istream& operator >> (istream& is, vector<T>& vec){for(T& val: vec) is >> val; return is;} template<class T> istream& operator , (istream& is, T& val){ return is >> val;} template<class T, class S> ostream& operator << (ostream& os, const pair<T,S>& p){return os << p.first << " " << p.second;} template<class T> ostream& operator << (ostream& os, const vector<T>& vec){for(size_t i=0; i<vec.size(); i++) os << vec[i] << (i==vec.size()-1?"":" "); return os;} template<class T> ostream& operator , (ostream& os, const T& val){ return os << " " << val;} template<class H> void print(const H& head){ cout << head; } template<class H, class ... T> void print(const H& head, const T& ... tail){ cout << head << " "; print(tail...); } template<class ... T> void println(const T& ... values){ print(values...); cout << endl; } template<class H> void eprint(const H& head){ cerr << head; } template<class H, class ... T> void eprint(const H& head, const T& ... tail){ cerr << head << " "; eprint(tail...); } template<class ... T> void eprintln(const T& ... values){ eprint(values...); cerr << endl; } class range{ Integer start_, end_, step_; public: struct range_iterator{ Integer val, step_; range_iterator(Integer v, Integer step) : val(v), step_(step) {} Integer operator * (){return val;} void operator ++ (){val += step_;} bool operator != (range_iterator& x){return step_ > 0 ? val < x.val : val > x.val;} }; range(Integer len) : start_(0), end_(len), step_(1) {} range(Integer start, Integer end) : start_(start), end_(end), step_(1) {} range(Integer start, Integer end, Integer step) : start_(start), end_(end), step_(step) {} range_iterator begin(){ return range_iterator(start_, step_); } range_iterator end(){ return range_iterator( end_, step_); } }; inline string operator "" _s (const char* str, size_t size){ return move(string(str)); } constexpr Integer my_pow(Integer x, Integer k, Integer z=1){return k==0 ? z : k==1 ? z*x : (k&1) ? my_pow(x*x,k>>1,z*x) : my_pow(x*x,k>>1,z);} constexpr Integer my_pow_mod(Integer x, Integer k, Integer M, Integer z=1){return k==0 ? z%M : k==1 ? z*x%M : (k&1) ? my_pow_mod(x*x%M,k>>1,M,z*x%M) : my_pow_mod(x*x%M,k>>1,M,z);} constexpr unsigned long long operator "" _ten (unsigned long long value){ return my_pow(10,value); } inline int k_bit(Integer x, int k){return (x>>k)&1;} //0-indexed mt19937 mt(chrono::duration_cast<chrono::nanoseconds>(chrono::steady_clock::now().time_since_epoch()).count()); template<class T> string join(const vector<T>& v, const string& sep){ stringstream ss; for(size_t i=0; i<v.size(); i++){ if(i>0) ss << sep; ss << v[i]; } return ss.str(); } inline string operator * (string s, int k){ string ret; while(k){ if(k&1) ret += s; s += s; k >>= 1; } return ret; } } constexpr long long mod = 9_ten + 7; class SCC{ int n; vector<vector<int> > G; vector<vector<int> > rG; void dfs(vector<bool> &visit, int pos, vector<int> &result){ visit[pos] = true; for(int i=0; i<G[pos].size(); i++){ if(visit[ G[pos][i] ]) continue; dfs(visit, G[pos][i], result); } result.push_back(pos); } void rdfs(vector<bool> &visit, int pos, int k){ visit[pos] = true; component[pos] = k; for(int i=0; i<rG[pos].size(); i++){ if(visit[ rG[pos][i] ]) continue; rdfs(visit, rG[pos][i], k); } } void make_rev(vector<vector<int> > &G){ for(int i=0; i<n; i++){ for(int j=0; j<G[i].size(); j++){ rG[ G[i][j] ].push_back(i); } } } public: int num_components; vector<int> component; vector< vector<int> > scc_graph; SCC(int n){ this->n = n; G.resize(n); rG.resize(n); } SCC(vector<vector<int> > &G){ this->n = G.size(); this->G = G; rG.resize(n); make_rev(G); } void strongly_connected_components(){ vector<bool> visit(n, false); vector<int> result; for(int i=0; i<n; i++){ if(visit[i]) continue; dfs(visit, i, result); } component.resize(n); fill(visit.begin(), visit.end(), false); int k=0; for(int i=result.size()-1; i>=0; i--){ if(visit[ result[i] ]) continue; rdfs(visit, result[i], k); k++; } num_components = k; scc_graph.resize( num_components ); for(int i=0; i<n; i++){ int cmp = component[i]; for(int j=0; j<G[i].size(); j++){ if(component[ G[i][j] ] == cmp) continue; scc_graph[cmp].push_back( component[ G[i][j] ] ); } } for(int i=0; i<scc_graph.size(); i++){ sort(scc_graph[i].begin(), scc_graph[i].end()); scc_graph[i].erase( unique(scc_graph[i].begin(), scc_graph[i].end()), scc_graph[i].end()); } } void add_edge(int from, int to){ G[from].push_back(to); rG[to].push_back(from); } }; void TopologicalSort_dfs(vector<vector<int> > &G, vector<int> &res, int node, vector<bool> &visit){ if(visit[node] == true) return; visit[node] = true; for(auto itr = G[node].rbegin(); itr != G[node].rend(); itr++){ TopologicalSort_dfs(G, res, *itr, visit); } /* for(int i=0; i<G[node].size(); i++){ TopologicalSort(G, res, G[node][i], visit); } */ res.push_back(node); } vector<int> TopologicalSort(vector<vector<int>> &G){ int n = G.size(); vector<int> ret; vector<bool> visit(n,false); for(int i=0; i<n; i++){ if(visit[i]) continue; TopologicalSort_dfs(G, ret, i, visit); } reverse(ret.begin(), ret.end()); return ret; } int main(){ int n; cin >> n; vector<string> u(n); cin >> u; if(n > 26*2){ println("Impossible"); return 0; } map<string, vector<int>> c; for(auto i : range(n) ){ c[ u[i].substr(0,1) ].push_back( (i+1) ); c[ u[i].substr( 1) ].push_back( (i+1) ); c[ u[i].substr(0,2) ].push_back( -(i+1) ); c[ u[i].substr( 2) ].push_back( -(i+1) ); } vector<vector<int>> G(2*n); for(auto p : c){ if(p.second.size() > 1){ for(int i=0; i<p.second.size(); i++){ for(int j=i+1; j<p.second.size(); j++){ if(i==j) continue; int x = p.second[i] < 0 ? -p.second[i]-1 + n : p.second[i]-1; int y = p.second[j] < 0 ? -p.second[j]-1 + n : p.second[j]-1; G[ (x+n)%(2*n) ].push_back( y ); G[ (y+n)%(2*n) ].push_back( x ); } } } } SCC scc(G); scc.strongly_connected_components(); bool ok = true; for(auto i : range(n) ){ if(scc.component[i] == scc.component[i+n]) ok = false; } if(!ok){ println("Impossible"); return 0; } auto& GG = scc.scc_graph; auto tp = TopologicalSort(GG); vector<int> ord(tp.size()); for(auto i : range(tp.size()) ){ ord[ tp[i] ] = i; } vector<int> ans(n,-1); for(int i=0; i<n; i++){ ans[i] = ord[ scc.component[i] ] < ord[ scc.component[i+n] ] ? 0 : 1; string s = ans[i]==0? u[i].substr(0,1) : u[i].substr(0,2); string t = ans[i]==0? u[i].substr(1) : u[i].substr(2); println(s,t); } return 0; }